Dough-mixing machine.



No. 656,602. Patented Aug. 2|, I900.

J. R. FARMEB. DOUGH MIXING MACHINE.

(Application filed Mar. 6, 1900.) N o M o [l e l .9

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NrrnD STATES PATENT OFFICE.

JOHN It. FARMER, OF ST. LOUIS, MISSOURI, ASSIGNOR OF TWO-THIRDS TO ADOLPH BOETTLER AND HENRY F. V. RUl-IE, OF SAME PLACE.

DOUGH-MIXI NG MACHINE.

SPECIFICATION forming part of Letters Patent No. 656,602, dated August 21, 1900.

Application filed March 6 1900. Serial No. 7,609. (No model.)

To all whom it may concern: of the crossbar 6 and bent into compound Be it known that 1, JOHN R. FARMER, a curves to" form beaters, by which the dough is citizen of'the United States, residing at the Worked orkneaded as the shaft 3 is revolved. city of St. Louis, in the State of Missouri, have 9 designates an air-box that is supplied with 5 invented certain new and useful lmproveairunder pressure fromaoonducting-pipe 10,

merits in Dough-Mixing Machines, of which that leads thereinto. The air-box 9 is surthe following is a full, clear, and exact derounded by a jacket 11, reference to the inscription, reference being had to the accomterior construction of which will be hereinpanying drawings, forming part of this speciafter made.

10 fication. I Leading from the air-box 9 is an outlet air- My invention relates to machines for mixpipe 12,that is equipped with a gage 13 for ing or kneading bread-dough, and has for its indicating the pressure under which the air is object the construction of a machine of such conveyed through said pipe. Connected to character that the dough may be thoroughly the air-pipe 12 isa chamber-housing 14, con- 15 mixed and beaten and at the same time be taining a chamber 15, that receives the lower aerated byinjecting air thereinto for the purend of a thermometer 16, designed to indicate pose of producing a perfect commingling of the temperature of the air flowing through the dough ingredients and rendering the the pipe 12. The chamber-housing 14 is prodough of superior quality. vided with a nipple 17, to which. is connected 20 My invention consists in features of novone end of a flexible tube 18, the opposite end elty hereinafter fully described, and pointed of the tube being joined to a short pipe 19, out in the claims. that is seated in the end of the hollow shaft Figure I is a top or plan View of my im' 3 and is secured by a stuffing-box gland 20. proved dough-mixing machine. Fig. II is a (See Fig. V.)

25 vertical cross-sectional view taken on the line In the operation of the machine the shaft II II, Fig. I. Fig. III is a vertical cross-sec- 3 is revolved through the dough in the doughtional view taken on the line III III, Fig. I, pan to turn the heaters therein, and at the through the convertible air heater or cooler. same time the air is forced through the air- Fig. IV is an enlarged detail View of a part box 9 from the pipe 10 and passes from said 3: of the air-conducting pipe and the gage and box through the pipe 12 and flexible tube 18 thermometer applied thereto, partly in secinto the hollow shaft to be delivered into the 8o tion, taken on the line IV IV, Fig. I. Fig. V dough through the perforations 4t in said is an enlarged detail sectional view through shaft, so that while the dough is being beaten the stuffingbox connection between the by the beater-rods 8, cutting paths therein,

35 beater-shaft and air-pipe, taken on the line the air is constantly forced into the dough V V, Fig. I. throughout the mass, thoroughly aerating it. 1 designates the dough-pan, and 2 stand- In cold weather it is necessary that the air ards by which said pan is supported. injected into the dough be heated to produce 3 designates a tubular shaft mounted in the proper temperature thereof, by which the 40 journal-bearings on the standards 2 and probest results maybe obtained, and to this end vided with a plurality of perforations 4 on Ihave provided aheating apparatus by which the part thereof located withinthe dough-pan. the air may be heated as it passes through The shaft is operated by power applied to the the air-box 9. Extending across the jacket gearing 5. Centrally located on the shaft 3 11, that surrounds the air-box, is a partition 5 within the dough-pan is a cross-bar 6, and 21, (see Fig. 111,) that with the coincident on the shaft, near the ends of the pan, are portions of the jacket-Walls inclosesahot-air 5 arms 7, that extend at right angles to the arms chamber 22. Located in the hot-air chamof the crossbar 6. her 22 are gas-burners 23, provided with jets 8 represents beater-rods fixed to the arms 24. The gas-burners 23 are supplied from a gas-conducting pipe 25, that leads from a suitable source of gas-supply. By the use of the gas-burners heat may be supplied within the hot-air chamber 22 to radiate therefrom to the air-box 9 and heat the air as it passes through said box to the dough-mixer.

In Warm weather it is necessary to reduce the temperature of the air to a proper degree, and to accomplish such reduction I provide an ice-chamber 26 above the air-box,that is closed by a door 27, hinged to the jacketwall. 28 is a shelf located at the bottom of the ice-chamber and surrounding the upper part of the air-box to prevent the ice from falling into the lower part of the jacket 11. By placing the proper amount of ice in the ice-box 26 the air-box may be cooled to the desired temperature previous to passing to the dough-mixer.

The air fed to the air-box 9 is compressed in a pump 29, (see Fig. 1,) the pump being Operated by a shaft 30, having connection therewith. The shaft 30 has fixed to it a gear- Wheel 31, the teeth of which mesh with the teeth of the gearing 5. By this arrangement the pump 29 is operated continuously during the operation of the dough-mixing mechanism, whereby a constant pressure of air is produced commensurate with the quantity of air desired to be injected into the dough being mixed.

I claim as my invention 1. In a dough-mixing machine, the combination of a dough-panfa hollow perforated shaft arranged therein, beaters carried by said shaft, means for operating the shaft, means for supplying air to said shaft to be ejected therefrom into the dough-pan, and means for heating said air, substantially as described.

2. In a dough-mixing machine, the c0mbination of a dough-pan, a hollow perforated shaft arranged in said pan, beaters carried thereby, means for operating said shaft, an air-box, a jacket surrounding said air-box, a hot-air chamber within said jacket, a burner in said hot-air chamber, and an air-conducting pipe leading from said air-box to said hollow shaft, substantially as described.

3. In a dough-mixing machine, the combination of a dough-pan, a hollow perforated beater-shaft arranged to operate in said pan, means for driving said shaft, means for conveying air to the interior of said shaft, and an air-pump having driving connection with said shaft-operating means, substantially as described.

JOHN R. FARHER.

In presence of- E. S. KNIGHT, N. V. ALEXANDER. 

